Add resources in README

Tested with TP-LINK MA180.
It returns the PDU message when sending a message with a length greater
than 56 (i don't really know why for now). These lines are ignored and
only the last one with the status is parsed.

.gitignore

@@ -16,3 +16,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+*.s[a-w][a-z]

.rspec

@@ -0,0 +1,2 @@
+--color
+--format progress

README.md

@@ -1,6 +1,6 @@
 # Biju
 
-[WIP] Biju is an easy way to mount a GSM modem to send, to receive and to delete messages through a ruby interface.
+Biju is an easy way to mount a GSM modem to send, to receive and to delete messages through a ruby interface.
 This is project is based on this [code snippet](http://dzone.com/snippets/send-and-receive-sms-text).
 
 ## Installation
@@ -20,24 +20,28 @@ Or install it yourself as:
 ## Usage
 
 ```
-@modem = Biju::Modem.new(:port => "/dev/tty.HUAWEIMobile-Modem")
+modem = Biju::Hayes.new('/dev/tty.HUAWEIMobile-Modem', pin: '0000')
 
 # method to list all messages
-@modem.messages.each do |sms|
+# it can take the status in argument
+# :unread, :read, :unsent, :sent, :all
+modem.messages.each do |sms|
   puts sms
 end
 
 # method to send sms
-sms = Biju::Sms.new(:phone_number => '+3312345678', :message => 'hello world')
-@modem.send(sms)
+sms = Biju::Sms.new(phone_number: '+3312345678', message: 'hello world')
+modem.send(sms)
 
-@modem.close
+modem.close
 ```
+
 ## TODO
 
 1. Write missing test for modem module.
 2. Write a documentation.
 3. Test with different kinds of modem and OS.
+4. Handle UDH (User Data Header) and SMS longer than 140 octets
 
 ## Contributing
 
@@ -46,3 +50,34 @@ sms = Biju::Sms.new(:phone_number => '+3312345678', :message => 'hello world')
 3. Commit your changes (`git commit -am 'Added some feature'`)
 4. Push to the branch (`git push origin my-new-feature`)
 5. Create new Pull Request
+
+## Resources
+
+http://en.wikipedia.org/wiki/GSM_03.40
+http://www.etsi.org/deliver/etsi_gts/04/0408/05.00.00_60/gsmts_0408v050000p.pdf
+http://www.etsi.org/deliver/etsi_ts/101000_101099/101032/05.01.00_60/ts_101032v050100p.pdf
+http://en.wikipedia.org/wiki/Short_message_service_center
+http://en.wikipedia.org/wiki/AT_command
+http://subnets.ru/saved/sms_pdu_format.html
+http://jazi.staff.ugm.ac.id/Mobile%20and%20Wireless%20Documents/SMS_PDU-mode.PDF
+http://www.sendsms.cn/download/SMS_PDU-mode.PDF
+http://www.sendsms.cn/download/wavecom/PDU%B6%CC%D0%C5%CF%A2/SMS_PDU-mode.PDF
+http://www.gsm-modem.de/sms-pdu-mode.html
+http://www.developershome.com/sms/cmgrCommand3.asp
+http://www.developershome.com/sms/cmgsCommand4.asp
+http://en.wikipedia.org/wiki/Concatenated_SMS
+
+# Encoding
+http://en.wikipedia.org/wiki/GSM_03.38
+http://www.3gpp.org/ftp/Specs/html-info/0338.htm
+http://www.codeproject.com/Tips/470755/Encoding-Decoding-7-bit-User-Data-for-SMS-PDU-PDU
+https://github.com/bitcoder/ruby_ucp/wiki/SMS-Alphabets
+
+# AT Commands
+http://en.wikipedia.org/wiki/Hayes_command_set
+https://www.sparkfun.com/datasheets/Cellular%20Modules/ADH8066-AT-Commands-v1.6.pdf
+http://www.coster.eu/costerit/teleges/doc/gsm822w.pdf
+http://www.developershome.com/sms/cmglCommand.asp
+http://www.zoomtel.com/documentation/dial_up/100498D.pdf
+
+AT+CLAC > list supported commands

Rakefile

@@ -1,9 +1 @@
-#!/usr/bin/env rake
 require "bundler/gem_tasks"
-require 'rake/testtask'
-
-Rake::TestTask.new do |t|
-  t.libs.push "lib"
-  t.test_files = FileList['spec/**/*_spec.rb']
-  t.verbose = true
-end

biju.gemspec

@@ -15,7 +15,8 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["lib"]
   gem.version       = Biju::VERSION
 
-  gem.add_development_dependency "minitest",    "3.0.0"
+  gem.add_development_dependency "rspec", "~> 2.14.0"
 
-  gem.add_dependency "serialport",              "1.0.4"
+  gem.add_dependency "serialport", "~> 1.1.0"
+  gem.add_dependency "parslet", "~> 1.5.0"
 end

lib/biju.rb

@@ -1,3 +1,7 @@
 require 'biju/version'
-require "biju/modem"
-require "biju/sms"
+require 'biju/modem'
+require 'biju/pdu'
+require 'biju/to_hayes'
+require 'biju/hayes'
+require 'biju/sms'
+require 'biju/parser'

lib/biju/at/cme_error.rb

@@ -0,0 +1,73 @@
+module Biju
+  module AT
+    # Message Equipement Failure
+    class CmeError < Error
+      ERRORS = {
+        0 => 'Phone failure',
+        1 => 'No connection to phone',
+        2 => 'Phone adapter link reserved',
+        3 => 'Operation not allowed',
+        4 => 'Operation not supported',
+        5 => 'PH_SIM PIN required',
+        6 => 'PH_FSIM PIN required',
+        7 => 'PH_FSIM PUK required',
+        10 => 'SIM not inserted',
+        11 => 'SIM PIN required',
+        12 => 'SIM PUK required',
+        13 => 'SIM failure',
+        14 => 'SIM busy',
+        15 => 'SIM wrong',
+        16 => 'Incorrect password',
+        17 => 'SIM PIN2 required',
+        18 => 'SIM PUK2 required',
+        20 => 'Memory full',
+        21 => 'Invalid index',
+        22 => 'Not found',
+        23 => 'Memory failure',
+        24 => 'Text string too long',
+        25 => 'Invalid characters in text string',
+        26 => 'Dial string too long',
+        27 => 'Invalid characters in dial string',
+        30 => 'No network service',
+        31 => 'Network timeout',
+        32 => 'Network not allowed, emergency calls only',
+        40 => 'Network personalization PIN required',
+        41 => 'Network personalization PUK required',
+        42 => 'Network subset personalization PIN required',
+        43 => 'Network subset personalization PUK required',
+        44 => 'Service provider personalization PIN required',
+        45 => 'Service provider personalization PUK required',
+        46 => 'Corporate personalization PIN required',
+        47 => 'Corporate personalization PUK required',
+        48 => 'PH-SIM PUK required',
+        100 => 'Unknown error',
+        103 => 'Illegal MS',
+        106 => 'Illegal ME',
+        107 => 'GPRS services not allowed',
+        111 => 'PLMN not allowed',
+        112 => 'Location area not allowed',
+        113 => 'Roaming not allowed in this location area',
+        126 => 'Operation temporary not allowed',
+        132 => 'Service operation not supported',
+        133 => 'Requested service option not subscribed',
+        134 => 'Service option temporary out of order',
+        148 => 'Unspecified GPRS error',
+        149 => 'PDP authentication failure',
+        150 => 'Invalid mobile class',
+        256 => 'Operation temporarily not allowed',
+        257 => 'Call barred',
+        258 => 'Phone is busy',
+        259 => 'User abort',
+        260 => 'Invalid dial string',
+        261 => 'SS not executed',
+        262 => 'SIM Blocked',
+        263 => 'Invalid block',
+        772 => 'SIM powered down',
+      }
+
+      def initialize(id)
+        super(id, 100)
+      end
+    end
+  end
+end

lib/biju/at/cms_error.rb

@@ -0,0 +1,99 @@
+module Biju
+  module AT
+    # Message Service Failure
+    class CmsError < Error
+      ERRORS = {
+        1 => 'Unassigned number',
+        8 => 'Operator determined barring',
+        10 => 'Call bared',
+        21 => 'Short message transfer rejected',
+        27 => 'Destination out of service',
+        28 => 'Unindentified subscriber',
+        29 => 'Facility rejected',
+        30 => 'Unknown subscriber',
+        38 => 'Network out of order',
+        41 => 'Temporary failure',
+        42 => 'Congestion',
+        47 => 'Recources unavailable',
+        50 => 'Requested facility not subscribed',
+        69 => 'Requested facility not implemented',
+        81 => 'Invalid short message transfer reference value',
+        95 => 'Invalid message unspecified',
+        96 => 'Invalid mandatory information',
+        97 => 'Message type non existent or not implemented',
+        98 => 'Message not compatible with short message protocol',
+        99 => 'Information element non-existent or not implemente',
+        111 => 'Protocol error, unspecified',
+        127 => 'Internetworking , unspecified',
+        128 => 'Telematic internetworking not supported',
+        129 => 'Short message type 0 not supported',
+        130 => 'Cannot replace short message',
+        143 => 'Unspecified TP-PID error',
+        144 => 'Data code scheme not supported',
+        145 => 'Message class not supported',
+        159 => 'Unspecified TP-DCS error',
+        160 => 'Command cannot be actioned',
+        161 => 'Command unsupported',
+        175 => 'Unspecified TP-Command error',
+        176 => 'TPDU not supported',
+        192 => 'SC busy',
+        193 => 'No SC subscription',
+        194 => 'SC System failure',
+        195 => 'Invalid SME address',
+        196 => 'Destination SME barred',
+        197 => 'SM Rejected-Duplicate SM',
+        198 => 'TP-VPF not supported',
+        199 => 'TP-VP not supported',
+        208 => 'D0 SIM SMS Storage full',
+        209 => 'No SMS Storage capability in SIM',
+        210 => 'Error in MS',
+        211 => 'Memory capacity exceeded',
+        212 => 'Sim application toolkit busy',
+        213 => 'SIM data download error',
+        255 => 'Unspecified error cause',
+        300 => 'ME Failure',
+        301 => 'SMS service of ME reserved',
+        302 => 'Operation not allowed',
+        303 => 'Operation not supported',
+        304 => 'Invalid PDU mode parameter',
+        305 => 'Invalid Text mode parameter',
+        310 => 'SIM not inserted',
+        311 => 'SIM PIN required',
+        312 => 'PH-SIM PIN required',
+        313 => 'SIM failure',
+        314 => 'SIM busy',
+        315 => 'SIM wrong',
+        316 => 'SIM PUK required',
+        317 => 'SIM PIN2 required',
+        318 => 'SIM PUK2 required',
+        320 => 'Memory failure',
+        321 => 'Invalid memory index',
+        322 => 'Memory full',
+        330 => 'SMSC address unknown',
+        331 => 'No network service',
+        332 => 'Network timeout',
+        340 => 'No +CNMA expected',
+        500 => 'Unknown error',
+        512 => 'User abort',
+        513 => 'Unable to store',
+        514 => 'Invalid Status',
+        515 => 'Device busy or Invalid Character in string',
+        516 => 'Invalid length',
+        517 => 'Invalid character in PDU',
+        518 => 'Invalid parameter',
+        519 => 'Invalid length or character',
+        520 => 'Invalid character in text',
+        521 => 'Timer expired',
+        522 => 'Operation temporary not allowed',
+        532 => 'SIM not ready',
+        534 => 'Cell Broadcast error unknown',
+        535 => 'Protocol stack busy',
+        538 => 'Invalid parameter',
+      }
+
+      def initialize(id)
+        super(id, 500)
+      end
+    end
+  end
+end

lib/biju/at/error.rb

@@ -0,0 +1,17 @@
+module Biju
+  module AT
+    class Error < ::Exception
+      ERRORS = {
+        1 => 'Unknown error',
+      }
+
+      def initialize(id, default = 1)
+        @error_id = (self.class::ERRORS.has_key?(id) ? id : default)
+      end
+
+      def to_s
+        "#{self.class::ERRORS[@error_id]} (#{@error_id})"
+      end
+    end
+  end
+end

lib/biju/hayes.rb

@@ -0,0 +1,159 @@
+require 'biju/at/error'
+require 'biju/at/cms_error'
+require 'biju/at/cme_error'
+
+module Biju
+  class Hayes
+    attr_reader :modem
+
+    MESSAGE_STATUS = {
+      unread: [0, 'REC UNREAD'],
+      read: [1, 'REC UNREAD'],
+      unsent: [2, ''],
+      sent: [3, ''],
+      all: [4, 'ALL'],
+    }
+
+    def initialize(port, options = {})
+      pin = options.delete(:pin) || '0000'
+      @modem = Modem.new(port, options)
+
+      attention
+      unlock_pin pin
+
+      text_mode(false)
+      extended_error
+    end
+
+    def close
+      modem.close
+    end
+
+    def at_command(cmd = nil, *args, &block)
+      command = ['AT', cmd].compact.join
+      command_args = args.compact.to_hayes
+
+      full_command = [command, (command_args.empty? ? nil : command_args)]
+        .compact.join('=') + "\r\n"
+
+      modem.flush
+      modem.write(full_command)
+      answer = hayes_to_obj(modem.wait(length: full_command.length))
+
+      return block.call(answer) if block_given?
+      answer
+    end
+
+    def attention
+      at_command[:status]
+    end
+
+    def init_modem
+      at_command('Z')[:status]
+    end
+
+    def phone_numbers
+      result = at_command('+CNUM')
+      return [] unless result.has_key?(:phone_numbers)
+
+      result[:phone_numbers].map do |number|
+        {
+          number: number[:array][1].gsub(/[^0-9]/, ''),
+          type_of_address: PDU::TypeOfAddress.new(number[:array][2]).to_sym
+        }
+      end
+    end
+
+    def text_mode(enabled = true)
+      at_command('+CMGF', enabled)[:status]
+    end
+
+    def text_mode?(force = false)
+      @text_mode = at_command('+CMGF?')[:result] if @text_mode.nil? || force
+      @text_mode
+    end
+
+    def extended_error(enabled = true)
+      at_command('+CMEE', enabled)[:status]
+    end
+
+    def prefered_storage(pms = nil)
+      result = at_command('+CPMS', pms)
+      return result[:array] if result[:cmd] == '+CPMS'
+      nil
+    end
+
+    def pin_status
+      at_command('+CPIN?')[:result]
+    end
+
+    def unlock_pin(pin)
+      at_command('+CPIN', pin)[:status] if pin_status == 'SIM PIN'
+    end
+
+    def messages!(which = :all)
+      messages(which, true)
+    end
+
+    def messages(which = :all, exceptions = false)
+      which = MESSAGE_STATUS[which][text_mode? ? 1 : 0] if which.is_a?(Symbol)
+
+      sms = at_command('+CMGL', which)
+
+      return [] unless sms.has_key?(:sms)
+      sms[:sms].map do |msg|
+        begin
+          Biju::Sms.from_pdu(msg[:message].chomp, msg[:infos][0])
+        rescue Biju::PDU::Errors::PDUError => e
+          malformed = Biju::PDU::Errors::MalformedSms.new(msg[:message].chomp, msg[:infos][0], e)
+          if exceptions
+            raise malformed
+          else
+            malformed
+          end
+        end
+      end
+    end
+
+    # Delete a sms message by id.
+    # @param [Fixnum] Id of sms message on modem.
+    def delete(id)
+      id = [id] if id.kind_of?(Fixnum)
+      return unless id.kind_of?(Enumerable)
+
+      res = true
+      id.each { |i| res &= at_command('+CMGD', i)[:status] }
+
+      res
+    end
+
+    def send(sms, options = {})
+      result = at_command('+CMGS', (sms.to_pdu.length - 2) / 2)
+
+      if result[:prompt]
+        modem.write("#{sms.to_pdu}#{26.chr}")
+        res = ''
+        loop do
+          res = modem.wait(length: 8)
+          break unless res.match(/\A[0-9A-Fa-f]+\r\n\z/)
+        end
+        hayes_to_obj(res.lstrip)
+      end
+    end
+
+    private
+
+    def hayes_to_obj(str)
+      res = ATTransform.new.apply(ATParser.new.parse(str))
+
+      case res[:cmd]
+      when '+CMS ERROR'
+        raise AT::CmsError.new(res[:result])
+      when '+CME ERROR'
+        raise AT::CmeError.new(res[:result])
+      end
+
+      res
+    end
+  end
+end

lib/biju/modem.rb

@@ -1,86 +1,42 @@
 require 'serialport'
-require_relative 'sms'
+require 'forwardable'
+require 'timeout'
 
 module Biju
   class Modem
+    extend Forwardable
+
+    DEFAULT_OPTIONS = { baud: 9600, data_bits: 8,
+                        stop_bits: 1, parity: SerialPort::NONE }
+
+    attr_reader :connection
 
     # @param [Hash] Options to serial connection.
     # @option options [String] :port The modem port to connect
     #
-    #   Biju::Modem.new(:port => '/dev/ttyUSB0')
+    #   Biju::Modem.new('/dev/ttyUSB0')
     #
-    def initialize(options={}, &block)
-      raise Exception.new("Port is required") unless options[:port]
-      pin = options.delete(:pin)
-      @connection = connection(options)
-      cmd("AT")
-      # initialize modem
-      cmd("ATZ")
-      # unlock pin code
-      cmd("AT+CPIN=\"#{pin}\"") if pin
-      # set SMS text mode
-      cmd("AT+CMGF=1")
-      # set extended error reports
-      cmd('AT+CMEE=1')
-      #instance_eval &block if block_given?
+    def initialize(port, options = {})
+      @connection = SerialPort.new(port, DEFAULT_OPTIONS.merge!(options))
     end
 
-    # Close the serial connection.
-    def close
-      @connection.close
+    def_delegators :connection, :close, :write
+
+    def flush
+      wait(length: 0, timeout: 0)
     end
 
-    # Return an Array of Sms if there is messages nad return nil if not.
-    def messages(which = "ALL")
-      # read message from all storage in the mobile phone (sim+mem)
-      cmd('AT+CPMS="MT"')
-      # get message list
-      sms = cmd('AT+CMGL="%s"' % which )
-      # collect messages
-      msgs = sms.scan(/\+CMGL\:\s*?(\d+)\,.*?\,\"(.+?)\"\,.*?\,\"(.+?)\".*?\n(.*)/)
-      return nil unless msgs
-      msgs.collect!{ |msg| Biju::Sms.new(:id => msg[0], :phone_number => msg[1], :datetime => msg[2], :message => msg[3].chomp) }
-    end
+    def wait(options = {})
+      length = options[:length] || 0
+      timeout = options[:timeout] || 10
 
-    # Delete a sms message by id.
-    # @param [Fixnum] Id of sms message on modem.
-    def delete(id)
-      cmd("AT+CMGD=#{id}")
-    end
-
-    def send(sms, options = {})
-      # initiate the sms, and wait for either
-      # the text prompt or an error message
-      cmd("AT+CMGS=\"#{sms.phone_number}\"")
-
-      # send the sms, and wait until
-      # it is accepted or rejected
-      cmd("#{sms.message}#{26.chr}")
-      # ... check reception
-    end
-
-    private
-    def connection(options)
-      port = options.delete(:port)
-      SerialPort.new(port, default_options.merge!(options))
-    end
-
-    def default_options
-      { :baud => 9600, :data_bits => 8, :stop_bits => 1, :parity => SerialPort::NONE }
-    end
-
-    def cmd(cmd)
-      @connection.write(cmd + "\r")
-      wait_str = wait
-      #p "#{cmd} --> #{wait_str}"
-    end
-
-    def wait
       buffer = ''
-      while IO.select([@connection], [], [], 0.25)
-        chr = @connection.getc.chr;
-        buffer += chr
+      Timeout.timeout(timeout) do
+        while IO.select([connection], [], [], 0.25) || buffer.length < length
+          buffer << connection.getc.chr
+        end
       end
+
       buffer
     end
   end

lib/biju/parser.rb

@@ -0,0 +1,109 @@
+require 'parslet'
+require 'date'
+
+module Biju
+  class ATParser < Parslet::Parser
+    root :at_string
+
+    rule(:at_string) { request | response }
+
+    # REQUEST
+    rule(:request) do
+      str('+++') | str('A/') | (prefix >> (cr.absent? >> lf.absent? >> any).repeat(0)) >>
+      (cr >> crlf >> response).maybe
+    end
+    rule(:prefix) { str('AT') | str('at') }
+
+    # RESPONSE
+    rule(:response) { ((command.maybe >> status) | merror) >> crlf | prompt }
+    rule(:prompt) { str('> ').as(:prompt) }
+    rule(:command) { mgl | num | pin | mgf | mgs | generic_response }
+
+    rule(:merror) do
+      (str('+CME ERROR') | str('+CMS ERROR')).as(:cmd) >> str(': ') >>
+        int.as(:result)
+    end
+
+    rule(:mgl) do
+      (str('+CMGL').as(:cmd) >> str(': ') >> infos >> crlf >> message >> crlf)
+        .repeat(1).as(:sms) >> crlf
+    end
+    rule(:num) do
+      (str('+CNUM').as(:cmd) >> str(': ') >> array >> crlf)
+        .repeat(1).as(:phone_numbers) >> crlf >> crlf
+    end
+    rule(:mgf) do
+      str('+CMGF').as(:cmd) >> str(': ') >> boolean.as(:result) >> crlf >> crlf
+    end
+    rule(:pin) do
+      str('+CPIN').as(:cmd) >> str(': ') >> eol.as(:result) >> crlf >> crlf
+    end
+    rule(:mgs) do
+      str('+CMGS').as(:cmd) >> str(': ') >> int.as(:result) >> crlf >> crlf
+    end
+    rule(:generic_response) do
+      match('[^:]').repeat(1).as(:cmd) >> str(': ') >> array >>
+      crlf >> crlf
+    end
+
+    rule(:array) do
+      (data >> (comma >> data).repeat).as(:array)
+    end
+    rule(:data) { (str('(') >> array >> str(')')) | info }
+    rule(:infos) { (info >> (comma >> info).repeat).as(:infos) }
+    rule(:info) { datetime | string | int | empty_string }
+    rule(:message) { match('[0-9A-Fa-f]').repeat(1).as(:message) }
+
+    # MISC
+    rule(:status) { (ok | error).as(:status) }
+    rule(:ok) { str('OK').as(:ok) }
+    rule(:error) { str('ERROR').as(:error) }
+
+    rule(:cr) { str("\r") }
+    rule(:lf) { str("\n") }
+    rule(:crlf) { cr >> lf }
+    rule(:comma) { str(',') }
+    rule(:quote) { str('"') }
+
+    rule(:empty_string) { str('').as(:empty_string) }
+    rule(:string) { quote >> match('[^\"]').repeat.as(:string) >> quote }
+    rule(:int) { match('[0-9]').repeat(1).as(:int) }
+    rule(:boolean) { match('[01]').as(:boolean) }
+    rule(:eol) { (crlf.absent? >> any).repeat.as(:string) }
+
+    rule(:datetime) { quote >> (date >> str(',') >> time).as(:datetime) >> quote }
+    rule(:date) do
+      (match('[0-9]').repeat(2) >> str('/')).repeat(2) >> match('[0-9]').repeat(2)
+    end
+    rule(:time) do
+      (match('[0-9]').repeat(2) >> str(':')).repeat(2) >> match('[0-9]').repeat(2) >>
+      match('[-+]') >> match('[0-9]').repeat(2)
+    end
+  end
+
+  class ATTransform < Parslet::Transform
+    rule(prompt: simple(:prompt)) { { prompt: true } }
+    rule(cmd: simple(:cmd), infos: subtree(:infos), message: simple(:message)) do
+      { cmd: cmd.to_s, infos: infos, message: message.to_s }
+    end
+    rule(cmd: simple(:cmd), array: subtree(:array)) do
+      { cmd: cmd.to_s, array: array }
+    end
+    rule(cmd: simple(:cmd), result: simple(:result)) do
+      { cmd: cmd.to_s, result: result }
+    end
+
+    rule(empty_string: simple(:empty_string)) { '' }
+    rule(int: simple(:int)) { int.to_i }
+    rule(boolean: simple(:boolean)) { boolean.to_i > 0 }
+    rule(string: simple(:string)) { string.to_s }
+    rule(datetime: simple(:datetime)) do
+      DateTime.strptime(datetime.to_s, '%y/%m/%d,%T%Z')
+    end
+    rule(array: subtree(:array)) { array }
+
+    rule(status: simple(:status)) { { status: status } }
+    rule(ok: simple(:ok)) { true }
+    rule(error: simple(:error)) { false }
+  end
+end

lib/biju/pdu.rb

@@ -0,0 +1,84 @@
+require 'biju/pdu/encoding/gsm7bit'
+require 'biju/pdu/encoding/ucs2'
+
+require 'biju/pdu/user_data'
+require 'biju/pdu/data_coding_scheme'
+
+require 'biju/pdu/first_octet'
+require 'biju/pdu/timestamp'
+require 'biju/pdu/phone_number'
+require 'biju/pdu/type_of_address'
+
+require 'biju/pdu/errors'
+
+module Biju
+  module PDU
+    def self.encode(phone_number, message, options = {})
+      type_of_address = options[:type_of_address] || :international
+
+      phone_number = PhoneNumber.encode(phone_number)
+      user_data = UserData.encode(message)
+      first_octet = FirstOctet.new.message_type_indicator!(:sms_submit)
+
+      [
+        # Length of SMSC information
+        # 0 means the SMSC stored in the phone should be used
+        '00',
+        # First octet
+        '%02x' % first_octet.binary,
+        # TP-Message-Reference
+        '00',
+        '%02x' % phone_number.length,
+        '%02x' % phone_number.type_of_address.hex,
+        phone_number.number,
+        # TP-PID: Protocol identifier
+        '00',
+        '%02x' % user_data.encoding.hex,
+        '%02x' % user_data.length,
+        user_data.message
+      ].join
+    end
+
+    def self.decode(string)
+      octets = string.scan(/../)
+
+      smsc_length = octets.shift.hex
+      smsc_number = octets.shift(smsc_length)
+
+      first_octet = FirstOctet.new(octets.shift.hex)
+
+      address_length = octets.shift.hex
+      address_type = octets.shift.hex
+      sender_number = PhoneNumber.new(
+        octets.shift(
+          (address_length.odd? ? address_length.succ : address_length) / 2).join,
+        type_of_address: address_type)
+
+      protocol_identifier = octets.shift
+      data_coding_scheme = octets.shift
+      timestamp = Timestamp.new(octets.shift(7).join).to_datetime
+      user_data_length = octets.shift.hex
+
+      user_data = UserData.new(message: octets.join,
+        encoding: data_coding_scheme,
+        length: user_data_length)
+
+      {
+        smsc_length: smsc_length,
+        smsc_number: smsc_number,
+
+        first_octet: first_octet,
+
+        address_length: address_length,
+        address_type: address_type,
+        sender_number: sender_number,
+
+        protocol_identifier: protocol_identifier,
+        data_coding_scheme: data_coding_scheme,
+        timestamp: timestamp,
+        user_data_length: user_data_length,
+        user_data: user_data
+      }
+    end
+  end
+end

lib/biju/pdu/data_coding_scheme.rb

@@ -0,0 +1,42 @@
+module Biju
+  module PDU
+    class DataCodingScheme
+      DATA_CODING_SCHEME = {
+        gsm7bit: 0,
+        gsm8bit: 4,
+        ucs2: 8,
+        reserved: 12,
+      }
+
+      def self.autodetect(message)
+        message.chars.each do |char|
+          return :ucs2 unless Encoding::GSM7Bit::BASIC_7BIT_CHARACTER_SET.include?(char) ||
+            Encoding::GSM7Bit::BASIC_7BIT_CHARACTER_SET_EXTENSION.has_value?(char)
+        end
+
+        :gsm7bit
+      end
+
+      def initialize(dcs, options = {})
+        unless dcs.is_a?(Symbol)
+          dcs = dcs.hex if dcs.is_a?(String)
+          if dcs & 0b11000000 == 0
+            dcs = DATA_CODING_SCHEME.key(dcs & 0b00001100)
+          else
+            raise Biju::PDU::Errors::DataCodingSchemeNotSupported.new(dcs)
+          end
+        end
+
+        @dcs = dcs
+      end
+
+      def to_sym
+        @dcs
+      end
+
+      def hex
+        DATA_CODING_SCHEME[@dcs]
+      end
+    end
+  end
+end

lib/biju/pdu/encoding/gsm7bit.rb

@@ -0,0 +1,116 @@
+# encoding: UTF-8
+
+module Biju
+  module PDU
+    module Encoding
+      class GSM7Bit
+        BASIC_7BIT_CHARACTER_SET = [
+          '@', '£', '$', '¥', 'è', 'é', 'ù', 'ì', 'ò', 'Ç', "\n", 'Ø', 'ø', "\r", 'Å', 'å',
+          "\u0394", '_', "\u03a6", "\u0393", "\u039b", "\u03a9", "\u03a0","\u03a8", "\u03a3", "\u0398", "\u039e", "\e", 'Æ', 'æ', 'ß', 'É',
+          ' ', '!', '"', '#', '¤', '%', '&', '\'', '(', ')', '*', '+', ',', '-', '.', '/',
+          '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', ':', ';', '<', '=', '>', '?',
+          '¡', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
+          'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'Ä', 'Ö', 'Ñ', 'Ü', '§',
+          '¿', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
+          'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'ä', 'ö', 'ñ', 'ü', 'à'
+        ]
+
+        BASIC_7BIT_CHARACTER_SET_EXTENSION = {
+          0x0A => "\n",
+          0x0D => '',
+          0x14 => '^',
+          0x1B => '',
+          0x28 => '{',
+          0x29 => '}',
+          0x2F => '\\',
+          0x3C => '[',
+          0x3D => '~',
+          0x3E => ']',
+          0x40 => '|',
+          0x65 => '€',
+        }
+
+        def self.decode(string, options = {})
+          length = options[:length] || 0
+
+          res = ''
+          next_char = 0
+          current_length = 0
+
+          string.scan(/../).map(&:hex).each_with_index do |octet, i|
+            index = i % 7
+            # Only keep the bits for the current character and
+            # add relevant bits from the previous octet
+            # to get the full septet and decode the current character
+            current = ((octet & (2**(7 - index) - 1)) << index) | next_char
+
+            res = add_char(res, current)
+            current_length += 1
+
+            # Break when the number of septet is reached
+            # to prevent to add a last @ when there is 7 septets.
+            # The last octet will have one more septet to ignore.
+            break if length > 0 && current_length >= length
+
+            # Get the relevant bits for the next character
+            next_char = octet >> (7 - index)
+            # When index is 6, next_char contains a full septet
+            if index == 6
+              res = add_char(res, next_char)
+              current_length += 1
+              next_char = 0
+            end
+          end
+
+          res
+        end
+
+        def self.encode(string)
+          res = ''
+          length = 0
+
+          string.chars.each do |char|
+            # Look for the current character in basic character set and
+            # extension and concatenate the reversed septets to get
+            # full octets
+            if get_septet(char)
+              res << get_septet(char).reverse
+              length += 1
+            elsif get_septet(char, escape: true)
+              res << get_septet("\e").reverse
+              res << get_septet(char, escape: true).reverse
+              length += 2
+            end
+          end
+          # Add necessary bits to get a full octet
+          res << ('0' * (8 - (res.length % 8))) unless res.length % 8 == 0
+
+          [
+            # Group by octet, reverse them and print them in hex
+            res.scan(/.{8}/).map { |octet| '%02x' % octet.reverse.to_i(2) }.join,
+            length: length,
+          ]
+        end
+
+        private
+
+        def self.add_char(string, char)
+          if string[-1] == "\e"
+            string.chop << BASIC_7BIT_CHARACTER_SET_EXTENSION[char]
+          else
+            string << BASIC_7BIT_CHARACTER_SET[char]
+          end
+        end
+
+        def self.get_septet(char, options = {})
+          escape = options[:escape] || false
+
+          char = (!escape ? BASIC_7BIT_CHARACTER_SET.index(char) : BASIC_7BIT_CHARACTER_SET_EXTENSION.key(char))
+
+          return nil unless char
+          '%07b' % char
+        end
+      end
+    end
+  end
+end

lib/biju/pdu/encoding/ucs2.rb

@@ -0,0 +1,23 @@
+module Biju
+  module PDU
+    module Encoding
+      class UCS2
+        def self.decode(string, options = {})
+          length = options[:length] || 0
+
+          string.scan(/.{4}/).map { |char| char.hex.chr('UCS-2BE') }.join
+          .encode('UTF-8', 'UCS-2BE')
+        end
+
+        def self.encode(string)
+          [
+            string.encode('UCS-2BE').chars.map do |char|
+              '%04x' % char.ord
+            end.join,
+            length: string.length * 2,
+          ]
+        end
+      end
+    end
+  end
+end

lib/biju/pdu/errors.rb

@@ -0,0 +1,38 @@
+module Biju
+  module PDU
+    module Errors
+      class PDUError < ::StandardError
+      end
+
+      class MalformedSms < PDUError
+        attr_reader :original_exception
+        attr_reader :pdu, :id
+
+        def initialize(pdu, id, original_exception = nil)
+          @id = id
+          @pdu = pdu
+          @original_exception = original_exception
+        end
+
+        def to_s
+          "This SMS can not be parsed: #{pdu} (#{original_exception.class}: #{original_exception})"
+        end
+      end
+
+      class DataCodingSchemeNotSupported < PDUError
+        attr_reader :data_coding_scheme
+
+        def initialize(dcs = nil)
+          @data_coding_scheme = dcs
+        end
+
+        def to_s
+          "This data coding scheme (0b#{data_coding_scheme.to_s(2)}) is not supported"
+        end
+      end
+
+      class EncodingNotSupported < PDUError
+      end
+    end
+  end
+end

lib/biju/pdu/first_octet.rb

@@ -0,0 +1,68 @@
+module Biju
+  module PDU
+    class FirstOctet
+      FIRST_OCTET = {
+        reply_path: 0b10000000,
+        user_data_header: 0b01000000,
+        status_report_request: 0b00100000,
+        validity_period_format: 0b00011000,
+        reject_duplicates: 0b00000100,
+        message_type_indicator: 0b00000011,
+      }
+
+      MESSAGE_TYPE_INDICATOR = {
+        sms_deliver: 0b00000000,
+        sms_submit: 0b00000001,
+        sms_status: 0b00000010,
+        reserved: 0b00000011,
+      }
+
+      VALIDITY_PERIOD_FORMAT = {
+        not_present: 0b00000000,
+        reserved: 0b00001000,
+        relative: 0b00010000,
+        absolute: 0b00011000,
+      }
+
+      attr_accessor :binary
+
+      def initialize(first_octet = 0)
+        self.binary = first_octet
+      end
+
+      def get(field)
+        binary & FIRST_OCTET[field]
+      end
+
+      [:reply_path, :user_data_header, :status_report_request,
+       :reject_duplicates].each do |sym|
+        define_method :"#{sym}?" do
+          get(sym) > 0
+        end
+
+        define_method :"#{sym}!" do |value = true|
+          if value
+            self.binary |= FIRST_OCTET[sym]
+          else
+            self.binary &= (FIRST_OCTET[sym] ^ 0b11111111)
+          end
+          self
+        end
+      end
+
+      [:message_type_indicator, :validity_period_format].each do |sym|
+        define_method sym do
+          self.class.const_get(sym.upcase).key(get(sym))
+        end
+
+        define_method :"#{sym}!" do |value|
+          hash = self.class.const_get(sym.upcase)
+
+          self.binary = ((binary & (FIRST_OCTET[sym] ^ 0b11111111)) |
+                         hash[value]) unless hash[value].nil?
+          self
+        end
+      end
+    end
+  end
+end

lib/biju/pdu/phone_number.rb

@@ -0,0 +1,33 @@
+module Biju
+  module PDU
+    class PhoneNumber
+      attr_accessor :type_of_address, :number
+
+      def self.encode(number, options = {})
+        type_of_address = options[:type_of_address] || :international
+
+        number = number + 'F' if number.length.odd?
+        new(
+          number.scan(/../).map(&:reverse).join,
+          type_of_address: type_of_address
+        )
+      end
+
+      def initialize(number, options = {})
+        type_of_address = options[:type_of_address] || :international
+
+        self.number = number
+        self.type_of_address = TypeOfAddress.new(type_of_address)
+      end
+
+      def decode
+        number.scan(/../).map(&:reverse).join.chomp('F')
+      end
+
+      def length
+        # If the last character is 0xF, remove this one from length
+        number.length - (number[-2].hex == 15 ? 1 : 0)
+      end
+    end
+  end
+end

lib/biju/pdu/timestamp.rb

@@ -0,0 +1,34 @@
+require 'date'
+
+module Biju
+  module PDU
+    class Timestamp
+      attr_reader :timestamp
+
+      def initialize(timestamp)
+        @timestamp = timestamp
+      end
+
+      def timezone
+        # The last 2 digits of the timestamp are for the timezone
+        timezone = timestamp[-2, 2].reverse.hex
+
+        # The MSB define the plus-minus sign. 0 for +, 1 for -
+        sign = (timezone >> 7 == 0 ? '+' : '-')
+
+        # The following 3 bits represent tens digit
+        # and the last 4 bits are for the units digit
+        tens_digit = ((timezone & 0b01110000) >> 4)
+        units_digit = (timezone & 0b00001111)
+
+        # Timezone is in quarters of an hour
+        sign << '%02d' % ((tens_digit * 10 + units_digit) / 4)
+      end
+
+      def to_datetime
+        DateTime.strptime(
+          "#{timestamp[0..-3].reverse}#{timezone}", '%S%M%H%d%m%y%Z')
+      end
+    end
+  end
+end

lib/biju/pdu/type_of_address.rb

@@ -0,0 +1,30 @@
+module Biju
+  module PDU
+    class TypeOfAddress
+      TYPE_OF_ADDRESS = {
+        unknown: 0b10000001,
+        international: 0b10010001,
+        national: 0b10100001,
+        reserved: 0b11110001,
+      }
+
+      def initialize(type_of_address, options = {})
+        type_of_address = :international if type_of_address.nil?
+
+        unless type_of_address.is_a?(Symbol)
+          type_of_address = type_of_address.hex if type_of_address.is_a?(String)
+          type_of_address = TYPE_OF_ADDRESS.key(type_of_address)
+        end
+        @type_of_address = type_of_address
+      end
+
+      def to_sym
+        @type_of_address
+      end
+
+      def hex
+        TYPE_OF_ADDRESS[@type_of_address]
+      end
+    end
+  end
+end

lib/biju/pdu/user_data.rb

@@ -0,0 +1,34 @@
+module Biju
+  module PDU
+    class UserData
+      ENCODING = {
+        gsm7bit: Encoding::GSM7Bit,
+        ucs2: Encoding::UCS2,
+      }
+
+      attr_accessor :encoding, :message, :length, :user_data_header
+
+      def self.encode(message, options = {})
+        encoding = options[:encoding] || DataCodingScheme.autodetect(message)
+
+        raise ArgumentError, 'Unknown encoding' unless ENCODING.has_key?(encoding)
+        res = ENCODING[encoding].encode(message)
+
+        new(message: res[0], length: res[1][:length], encoding: encoding)
+      end
+
+      def initialize(options = {})
+        self.encoding = DataCodingScheme.new(options[:encoding] || :gsm7bit)
+        self.message = options[:message] || ''
+
+        self.length = options[:length] || 0
+
+        self.user_data_header = options[:user_data_header] || false
+      end
+
+      def decode
+        ENCODING[encoding.to_sym].decode(message, length: length)
+      end
+    end
+  end
+end

lib/biju/sms.rb

@@ -1,19 +1,30 @@
+require 'date'
+
 module Biju
   class Sms
-    attr_accessor :id, :phone_number, :datetime, :message
+    attr_reader :id, :phone_number, :type_of_address, :message, :datetime
 
-    def initialize(params={})
+    def self.from_pdu(string, id = nil)
+      sms_infos = PDU.decode(string)
+      new(id: id,
+          phone_number: sms_infos[:sender_number].decode,
+          type_of_address: sms_infos[:sender_number].type_of_address.to_sym,
+          datetime: sms_infos[:timestamp],
+          message: sms_infos[:user_data].decode)
+    end
+
+    def initialize(params = {})
       params.each do |attr, value|
-        self.public_send("#{attr}=", value)
+        instance_variable_set(:"@#{attr}", value)
       end if params
     end
 
-    def datetime
-      @datetime.sub(/(\d+)\D+(\d+)\D+(\d+),(\d*\D)(\d*\D)(\d+)(.*)/, '20\1-\2-\3 \4\5\6')
+    def to_s
+      "[#{id}] (#{phone_number}) #{datetime} '#{message}'"
     end
 
-    def to_s
-      "#{id} - #{phone_number} - #{datetime} - #{message}"
+    def to_pdu
+      Biju::PDU.encode(phone_number, message, type_of_address: type_of_address)
     end
   end
 end

lib/biju/to_hayes.rb

@@ -0,0 +1,19 @@
+class Object
+  def to_hayes; "\"#{to_s}\""; end
+end
+
+class Fixnum
+  def to_hayes; to_s; end
+end
+
+class TrueClass
+  def to_hayes; '1'; end
+end
+
+class FalseClass
+  def to_hayes; '0'; end
+end
+
+class Array
+  def to_hayes; map(&:to_hayes).join(','); end
+end

lib/biju/version.rb

@@ -1,3 +1,3 @@
 module Biju
-  VERSION = "0.0.2"
+  VERSION = '0.0.2'
 end

spec/biju/modem_spec.rb

@@ -1,10 +0,0 @@
-require_relative '../spec_helper'
-
-# TODO: Fix missing tests SOON
-describe Biju::Modem do
-  describe ".new" do
-    it "should raise an Exception without port option" do
-      lambda { Biju::Modem.new }.must_raise Exception
-    end
-  end
-end

spec/biju/parser_spec.rb

@@ -0,0 +1,144 @@
+require 'spec_helper'
+require 'biju/parser'
+
+describe Biju::ATParser do
+  context "status" do
+    it "returns ok status" do
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse("AT\r\r\nOK\r\n"))
+      expect(result).to include(status: true)
+    end
+
+    it "returns error status" do
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse("AT\r\r\nERROR\r\n"))
+      expect(result).to include(status: false)
+    end
+  end
+
+  context "errors" do
+    it "parses CMS ERROR" do
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse("AT\r\r\n+CMS ERROR: 500\r\n"))
+      expect(result[:cmd]).to eq('+CMS ERROR')
+      expect(result[:result]).to eq(500)
+    end
+
+    it "parses CME ERROR" do
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse("AT\r\r\n+CME ERROR: 100\r\n"))
+      expect(result[:cmd]).to eq('+CME ERROR')
+      expect(result[:result]).to eq(100)
+    end
+  end
+
+  context "response" do
+    it "parses generic response" do
+      resp = "AT+COPS\r\r\n+COPS: 1,\"two\",(3,4)\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(resp))
+
+      expect(result[:cmd]).to eq('+COPS')
+      expect(result[:array]).to have(3).fields
+
+      expect(result[:array]).to include(1)
+      expect(result[:array]).to include('two')
+      expect(result[:array]).to include([3,4])
+    end
+
+    it "parses cmgs prompt" do
+      mgs = "AT+CMGS=18\r\r\n> "
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(mgs))
+
+      expect(result).to include(prompt: true)
+    end
+
+    it "parses messages list" do
+      messages = "AT+CMGL=1\r\r\n" <<
+                  "+CMGL: 0,1,,23\r\n" <<
+                  "07913396050066F3040B91336789\r\n" <<
+                  "+CMGL: 3,1,,74\r\n" <<
+                  "BD60B917ACC68AC17431982E066BC5642205F3C95400\r\n" <<
+                  "+CMGL: 4,1,,20\r\n" <<
+                  "07913396050066F3040B913364446864\r\n" <<
+                  "\r\n" <<
+                  "OK\r\n"
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(messages))
+
+      expect(result).to include(status: true)
+      expect(result[:sms]).to have(3).messages
+      expect(result[:sms][0][:message]).to eq('07913396050066F3040B91336789')
+    end
+
+    it "gets phone numbers" do
+      pms = "AT+CNUM\r\r\n+CNUM: \"M\",\"+33666666666\",145\r\n\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(pms))
+
+      expect(result[:phone_numbers][0][:cmd]).to eq('+CNUM')
+      expect(result[:phone_numbers]).to have(1).phone_number
+      expect(result[:phone_numbers][0][:array][1]).to eq('+33666666666')
+    end
+
+    it "gets messages storage" do
+      pms = "AT+CPMS=?\r\r\n+CPMS: ((\"SM\",\"BM\",\"SR\"),(\"SM\"))\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(pms))
+
+      expect(result[:cmd]).to eq('+CPMS')
+      expect(result[:array]).to have(2).storage
+      expect(result[:array][0]).to have(3).storage
+    end
+
+    it "gets specified message storage infos" do
+      pms = "AT+CPMS=\"MT\"\r\r\n+CPMS: 23,23,7,100,7,100\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(pms))
+
+      expect(result).to include(status: true)
+      expect(result[:array]).to have(6).storage
+      expect(result[:array]).to eq([23, 23, 7, 100, 7, 100])
+    end
+
+    it "gets pin status" do
+      pin = "AT+CPIN?\r\r\n+CPIN: READY\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(pin))
+
+      expect(result).to include(status: true)
+      expect(result[:result]).to eq("READY")
+    end
+
+    it "parses +CMGF? response" do
+      mgf = "AT+CMGF?\r\r\n+CMGF: 0\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(mgf))
+
+      expect(result).to include(status: true)
+      expect(result[:result]).to be_false
+    end
+
+    it "parses message sent response" do
+      mgs = "+CMGS: 163\r\n\r\nOK\r\n"
+
+      result = Biju::ATTransform.new.apply(
+        Biju::ATParser.new.parse(mgs))
+
+      expect(result).to include(status: true)
+      expect(result[:result]).to eq(163)
+    end
+  end
+
+  it "raises ParseFailed exception" do
+    expect { Biju::ATParser.new.parse('Ha') }.to raise_error(Parslet::ParseFailed)
+  end
+end

spec/biju/pdu/data_coding_scheme_spec.rb

@@ -0,0 +1,30 @@
+# encoding: UTF-8
+require 'spec_helper'
+require 'biju/pdu'
+
+describe Biju::PDU::DataCodingScheme do
+  describe '::autodetect' do
+    it "autodetects gsm7bit encoding" do
+      [
+        "Test",
+        "Ç$",
+        "[teßt}",
+      ].each do |string|
+        expect(Biju::PDU::DataCodingScheme.autodetect(string)).to eq(:gsm7bit)
+      end
+    end
+
+    it "autodetects ucs2 encoding" do
+      [
+        "ç",
+        "âmazing",
+      ].each do |string|
+        expect(Biju::PDU::DataCodingScheme.autodetect(string)).to eq(:ucs2)
+      end
+    end
+  end
+
+  subject { Biju::PDU::DataCodingScheme.new(:gsm7bit) }
+  its(:to_sym) { should eq(:gsm7bit) }
+  its(:hex) { should eq(0) }
+end

spec/biju/pdu/encoding/gsm7bit_spec.rb

@@ -0,0 +1,47 @@
+# encoding: UTF-8
+require 'spec_helper'
+require 'biju/pdu/encoding/gsm7bit'
+
+describe Biju::PDU::Encoding::GSM7Bit do
+  describe '::decode' do
+    it "decodes string" do
+      expect(Biju::PDU::Encoding::GSM7Bit.decode('D4F29C0E', length: 4)).to eq('Test')
+    end
+
+    it "decodes character from extension set" do
+      expect(Biju::PDU::Encoding::GSM7Bit.decode('9B32', length: 2)).to eq('€')
+    end
+
+    it "decodes character with a length of 7" do
+      expect(Biju::PDU::Encoding::GSM7Bit.decode('E170381C0E8701', length: 7)).to eq('a' * 7)
+    end
+  end
+
+  describe '::encode' do
+    it "encodes string" do
+      expect(Biju::PDU::Encoding::GSM7Bit.encode('Test').first.upcase).to eq('D4F29C0E')
+    end
+
+    it "encodes character from extension set" do
+      expect(Biju::PDU::Encoding::GSM7Bit.encode('€').first.upcase).to eq('9B32')
+    end
+
+    it "encodes character with a length of 7" do
+      expect(Biju::PDU::Encoding::GSM7Bit.encode('a' * 7).first.upcase).to eq('E170381C0E8701')
+    end
+  end
+
+  it "gives same text after encoding and decoding" do
+    strings = [
+      'My first TEST',
+      '{More complicated]',
+      'And on€ More~',
+      'a' * 7,
+    ]
+
+    strings.each do |string|
+      expect(Biju::PDU::Encoding::GSM7Bit.decode(
+        *Biju::PDU::Encoding::GSM7Bit.encode(string))).to eq(string)
+    end
+  end
+end

spec/biju/pdu/encoding/ucs2_spec.rb

@@ -0,0 +1,31 @@
+# encoding: UTF-8
+require 'spec_helper'
+require 'biju/pdu/encoding/ucs2'
+
+describe Biju::PDU::Encoding::UCS2 do
+  describe '::decode' do
+    it "decodes string" do
+      expect(Biju::PDU::Encoding::UCS2.decode('00C700E700E200E300E500E4016B00F80153', length: 4)).to eq('Ççâãåäūøœ')
+    end
+  end
+
+  describe '::encode' do
+    it "encodes string" do
+      expect(Biju::PDU::Encoding::UCS2.encode('Ççâãåäūøœ').first.upcase).to eq('00C700E700E200E300E500E4016B00F80153')
+    end
+  end
+
+  it "gives same text after encoding and decoding" do
+    strings = [
+      'My first TEST',
+      '{More çomplicated]',
+      'And on€ More~',
+      'þß®',
+    ]
+
+    strings.each do |string|
+      expect(Biju::PDU::Encoding::UCS2.decode(
+        *Biju::PDU::Encoding::UCS2.encode(string))).to eq(string)
+    end
+  end
+end

spec/biju/pdu/first_octet_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+require 'biju/pdu'
+
+describe Biju::PDU::FirstOctet do
+  its(:reply_path?) { should be_false }
+  its(:user_data_header?) { should be_false }
+  its(:status_report_request?) { should be_false }
+  its(:reject_duplicates?) { should be_false }
+
+  its(:message_type_indicator) { should eq(:sms_deliver) }
+  its(:validity_period_format) { should eq(:not_present) }
+end

spec/biju/pdu/phone_number_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+require 'biju/pdu'
+
+describe Biju::PDU::PhoneNumber do
+  describe '::encode' do
+    subject { Biju::PDU::PhoneNumber.encode('33123456789') }
+    its(:number) { should eq('3321436587F9') }
+  end
+
+  context "odd length" do
+    subject { Biju::PDU::PhoneNumber.new('3321436587F9') }
+    its(:decode) { should eq('33123456789') }
+    its(:length) { should eq(11) }
+  end
+
+  context "even length" do
+    subject { Biju::PDU::PhoneNumber.new('3321436587') }
+    its(:decode) { should eq('3312345678') }
+    its(:length) { should eq(10) }
+  end
+end

spec/biju/pdu/timestamp_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+require 'biju/pdu'
+
+describe Biju::PDU::Timestamp do
+  subject { Biju::PDU::Timestamp.new('31900141039580') }
+
+  its(:timezone) { should eq('+02') }
+  its(:to_datetime) { should eq(DateTime.new(2013, 9, 10, 14, 30, 59, '+02')) }
+end

spec/biju/pdu/type_of_address_spec.rb

@@ -0,0 +1,9 @@
+require 'spec_helper'
+require 'biju/pdu'
+
+describe Biju::PDU::TypeOfAddress do
+  subject { Biju::PDU::TypeOfAddress.new(:international) }
+
+  its(:to_sym) { should eq(:international) }
+  its(:hex) { should eq(145) }
+end

spec/biju/pdu/user_data_spec.rb

@@ -0,0 +1,12 @@
+require 'spec_helper'
+require 'biju/pdu'
+
+describe Biju::PDU::UserData do
+  subject(:message) { 'Test' }
+  subject(:encoded) { Biju::PDU::Encoding::GSM7Bit.encode(message) }
+  subject { Biju::PDU::UserData.encode(message, encoding: :gsm7bit) }
+
+  its(:message) { should eq(encoded[0]) }
+  its(:length) { should eq(encoded[1][:length]) }
+  its(:decode) { should eq(message) }
+end

spec/biju/sms_spec.rb

@@ -1,15 +1,40 @@
-require_relative '../spec_helper'
+require 'spec_helper'
+require 'biju'
 
 describe Biju::Sms do
-  subject { Biju::Sms.new(:id => "1", :phone_number => "144", :datetime => "11/07/28,15:34:08-12", :message => "Some text here")}
+  subject do
+    Biju::Sms.new(
+      id: 1,
+      phone_number: "144",
+      datetime: DateTime.new(2011, 7, 28, 15, 34, 8, '-12'),
+      message: "Some text here")
+  end
 
-  it { subject.id.must_equal "1" }
+  its(:id) { should eq(1) }
+  its(:phone_number) { should eq("144") }
+  its(:datetime) { should eq(DateTime.new(2011, 7, 28, 15, 34, 8, '-12')) }
+  its(:message) { should eq("Some text here") }
 
-  it { subject.phone_number.must_equal "144" }
+  describe '::from_pdu' do
+    subject do
+      Biju::Sms.from_pdu(
+        '07913396050066F3040B913366666666F600003190509095928004D4F29C0E')
+    end
 
-  it { subject.datetime.must_equal "2011-07-28 15:34:08" }
+    its(:datetime) { should eq(DateTime.new(2013, 9, 5, 9, 59, 29, '+02')) }
+    its(:message) { should eq('Test') }
+    its(:phone_number) { should eq('33666666666') }
+    its(:type_of_address) { should eq(:international) }
+  end
 
-  it { subject.message.must_equal "Some text here" }
+  describe '#to_pdu' do
+    subject do
+      Biju::Sms.new(
+        phone_number: '33666666666',
+        type_of_address: :international,
+        message: 'Test').to_pdu.upcase
+    end
 
-  it { subject.to_s.must_equal "1 - 144 - 2011-07-28 15:34:08 - Some text here"}
-end
+    it { should eq('0001000B913366666666F6000004D4F29C0E') }
+  end
+end

spec/biju/to_hayes_spec.rb

@@ -0,0 +1,10 @@
+require 'spec_helper'
+require 'biju/to_hayes'
+
+describe "blah blah" do
+  it { expect(5.to_hayes).to eq('5') }
+  it { expect(true.to_hayes).to eq('1') }
+  it { expect(false.to_hayes).to eq('0') }
+  it { expect("test".to_hayes).to eq('"test"') }
+  it { expect([1, 2].to_hayes).to eq('1,2') }
+end

spec/spec_helper.rb

@@ -1,2 +1,17 @@
-require 'minitest/autorun'
-require "./lib/biju"
+# This file was generated by the `rspec --init` command. Conventionally, all
+# specs live under a `spec` directory, which RSpec adds to the `$LOAD_PATH`.
+# Require this file using `require "spec_helper"` to ensure that it is only
+# loaded once.
+#
+# See http://rubydoc.info/gems/rspec-core/RSpec/Core/Configuration
+RSpec.configure do |config|
+  config.treat_symbols_as_metadata_keys_with_true_values = true
+  config.run_all_when_everything_filtered = true
+  config.filter_run :focus
+
+  # Run specs in random order to surface order dependencies. If you find an
+  # order dependency and want to debug it, you can fix the order by providing
+  # the seed, which is printed after each run.
+  #     --seed 1234
+  config.order = 'random'
+end